2000 pontiac montana Occasionaly, when turning the key to start, it will be dead dash lights will illuminate, but no life to engine to start it What's up?

The security, antitheft or lock picture/icon is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. This link explains it pretty well.
http://www.diy-gm-security.com/

just Bought a 2002 montana what problems do they have? - Car ...

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Dec 7, 2005 - We purchased a 2002 Montana about a year and a half ago with 27k miles. ... Talked to a neighbor that is a mechanic, and he said the pontiac

my 2002 pontiac montana will turn over but will not start ...

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sound like ignition switch going bad or have loose wire to ignition switch.

replaced the oil and re set computer to fresh oil change
thes older models will only go aproxamitly 5000k on oil change
it may not have been reset at last oil change
key on run motor off depressed gas pedal to floor 3 times within 5 seconds of key on run
then start motor to re set oil life system

Do you mean the "Oil" light or the "Oil Life System" light?
.
If the oil light is on, you need to stop operating the engine and have it checked to find out why the light is telling you that there is no oil pressure.

If you mean the Oil Life light, Then here are the instructions:

How to Reset the CHANGE ENGINE OIL Message

1. With the ignition key in RUN but the engine off,

fully push and release the accelerator pedal slowly

three times within five seconds.

2. Turn the key to OFF.

If the CHANGE ENGINE OIL message comes

back on, the engine oil life monitor has not reset.
Repeat the procedure.

You can also download a PDF version of your owner's manual for free.
2000 Pontiac Montana Owner's Manual

Perfect example of a dead battery. When they go, they go quickly. The plates shed material very gradually over the years. When that material piles up high enough in the bottom of the battery, the battery short-circuits itself--even if it started the car just fine ten minutes prior. Jump start the engine to get home or to the auto parts store. The alternator will supply the power to keep the engine running. (Don't turn off the engine 'til you're back home!)

Pontiac Montana, 2005
With the ignition key in RUN but engine off, repeatedly push the trip reset button until OIL is displayed on the driver info center. Once OIL is displayed, push and hold the reset button for five seconds. The number will disappear and be replaced by 100% of oil life remaining. The percentage will return to 100 and oil life indicator will be reset. Repeat steps if not reset to 100.
Good luck

Pontiac Aztek, Montana 2001-05 w/o (DIC) Driver Information Center; Torrent, Ascender 2006

Turn the ignition to ON, with the engine off. Fully depress and release the accelerator pedal slowly three times within five seconds. Turn the key to OFF If the CHANGE ENGINE OIL’ message comes back on when you start your vehicle, the engine oil life system has not reset. Repeat the procedure.

Pontiac Aztek, Montana 2001-06 wI (DIC) Driver Information Center

urn the ignition to ON, with the engine off. Press the MODE button until the DIC reads ‘OIL LIFE LEFT/HOLD SET TO RESET Press and hold the SET button until 100% is displayed. You will hear three chimes and the “CHANGE ENGINE OIL” message will go off. Turn the key to OFF. If the “CHANGE ENGINE OIL” message comes back on when you start your vehicle, the engine oil life system has not reset. Repeat the procedure.

Good luck

generally such problems occur due to sensors, it may be your vehicle's crankshaft sensor. have it checked.

the boards in the tail lights have issues the plugs melt and they screw up the grounds. if your dash light signal indicators or on steady at night then chances are you will need new harnesses and light board assemblies